Arlrmm,,. CO^rrORTT.E. /J03 



n-tooMicil. Antlinrs usually witli narrow tips. Akonos oLovnid or ol)long, mostly 

 roundod at the apex and with a rather small terminal areola, almost always j^labrous. 

 Pappus none, or in one species a vestige. — Herbs or undershrubs, bitter and 

 odorous ; with alternate leaves most commonly dissected, and the numerous small 

 h^ads of yellow or yellowish flowers usually nodding, and racemose or panicled, 

 sometimes paniodate-spicatc. 



All iiiiiiioiisn gcmis iniiiiily of tlio nortliern hemisphere, its hefiihiiiarters in Northern Asi.i ; not 

 inaiiy species in California, and fewer still in the Atlantic Slates ; hut ahonmliii^ through tlio 

 interior arid region, where the Sugr-bitshrs form (i characteristic feature. Our species are all per- 

 ennials, A. Imiinis, Wilhl., not having been I'onnd so far west. To facilitate tlio detenniuation 

 of the species an artificial key is appended. 

 Heihaceons, or hardly woody at the base ; 



Oreen and nearly glabrous : leaves linear, entire, 

 Green, becoming glabrous : leaves twice pinnately parted, 

 White-cottony underneath the leaves ; upper face green. 

 Lobes of the leaves lanceolate, a(uite, 

 Lobes of the leaves narrowly linear, 

 White-col tony throughout, 

 Silky villous all over, 

 Shrubby and si)iny : heads few and scattered, 

 Shrubby, unarmed. (See also No. 7.) 



Grayish-puberulent : pinnate leaves with long filiform divisions, 1. A. Californica. 



White-pubescent : leaves palmately cleft or toothed, sometimes entire. 

 One to 6 feet hi^h : leaves about 3-toothed, 9. A. tridentata. 



A sjian or two high : leaves deeply cleft or some entire : 



Their 3 lobes linear, 10. A. trifida. 



Their 3 to 5 lobes obovato or spatulate, 11. A. aruusoula. 



§ 1. Flowers hetprognmnns {Rome of the marginal ones pistillate onlij), hut all fertile : 

 receptacle not villous. — Abuotanum, ]>csser. 



* Shrnhhy : lobes of the cinereons-2}uberulent leaves filiform-luiear. 



1. A. Californica, Less. About 4 feet high, with a decidedly Avoody base, 

 very leafy : leaves all pinnately 3 - 7-parted into almost fdiform divisions, or some 

 of the uppermost entire : heads small and numerous in narrow racemose panicles : 

 scales of the involucre broad, nearly glabrous : akenes somewhat turbinate and 

 3-5-ribbed, utricular, with a very broad and somewhat toothed summit. — A. 

 Fischcriaiia, Besser. A. foliosa Sc A. abrotanoides, Nutt. 



Dry banks, from below Santa Barbara to San Francisco. Heads roundish, about 2 lines in 

 diameter. Keceptacle hemispherical, naked, not hairy, as said by Nuttall. 



* * Herbaceous : leaves or their lobes linear-lanceolate or broader. 



+- Not ibhite-cottony : corolla sparseli/ hairy. 



2. A. Norvegica, Fries. A span to 2 feet high, stout, loosely villous'-pubescent 

 when young, or glabrous : leaves mostly bipiimately parted or cleft into linear- 

 lanceolate or broader acute lobes, or the uppermost reducerl to trifid or pimi)lo 

 bracts: heads large, in a simple naked panicle or loose mcome : scales of the invo- 

 lucre oblong, brownish : akenes oblong, about 5-angled. — Novit. Suec. ed. 1 (1817), 

 56. A. rnpestris, Fl. Dan. t. 801. A. arctica, Less. (1831). A. Chamissonixina, 

 *Besser in Hook. Fl. 



North side of Wood's Peak in the Sieri» Nevada, at 0,000 feet, Brciocr. Also in the Rocky and 

 other high mountains to Alaska, Arctic America, E. Siberin, and the Norwegian Alps. Heads 

 globular, about 4 lines in diameter. 



-t- -t- Leaves ivliite-rnttony-tovientose uvderneath or on bnlli sldin : rorolla glabrous. 



3. A. vulgaris, Linn. A foot or two high ; brancdiing : leaves green and gla- 

 brous or soon becoming so above, cottony-tomentose bonenth. Incininti'lv onco or 

 twice pinnatiiid, or souie of the upper sparingly lobcil or loolln-d ; tlu- lobes lanceo- 



